The article on this I read a few days ago was saying nothing about the concrete but they were actually trying to damage the wellhead itself so that the automatic systems would kick in and stop the flow. From there the firefighters would have a chance to extinguish the flames without a constant fresh supply of fuel messing up their efforts.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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